S
M
T
W
T
F
S
26
89°
63°
27
76°
56°
28
85°
51°
29
93°
64°
30
89°
68°
1
80°
62°
2
63°
53°
3
75°
51°
4
83°
48°
5
86°
55°
6
92°
61°
7
82°
67°
8
80°
66°
9
74°
65°
10
87°
67°
11
91°
66°
12
75°
62°
13
83°
61°
14
86°
59°
15
84°
51°
16
91°
59°
17
93°
70°
18
90°
65°
19
93°
64°
20
92°
63°
21
94°
66°
22
92°
71°
23
87°
68°
24
84°
70°
25
86°
70°
26
89°
70°
27
86°
70°
28
86°
70°
29
83°
69°
30
82°
66°
31
81°
63°
1
83°
64°
2
84°
67°
3
86°
66°
4
89°
65°
5
88°
66°
6
86°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Fairfax
Fairfax's May 2026 forecast shows daily high temperatures ranging from 81° to 89°, with overnight lows between 63° and 70°. The average high for May is 85° with an average low of 67°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Fairfax. See also: June | July | August.
